/magmi/plugins/base/itemprocessors/importlimiter/01_importlimiter.php

<?php
class ImportLimiter extends Magmi_ItemProcessor
{
	protected $_recranges;
	protected $_rmax=-1;
	protected $_filters;
	
	public function getPluginInfo()
	{
		return array("name"=>"Magmi Import Limiter",
					 "author"=>"Dweeves",
					 "version"=>"0.0.5",
					 "url"=>"http://sourceforge.net/apps/mediawiki/magmi/index.php?title=Magmi_Import_Limiter");
	}
	
	
	public function filtermatch($item,$fltdef)
	{
		$negate=0;
		$field=$fltdef[0];
		$match=false;
		if($field[0]=="!")
		{
			$field=substr($field,1);
			$negate=1;
		}
		$re=$fltdef[1];
		if(in_array($field,array_keys($item)))
		{
			$v=$item[$field];
			$match=preg_match("|$re|",$v);
			if($negate)
			{
				$match=!$match;
			}
			if($match)
			{
			  $this->log("skipping sku {$item['sku']} => Filter '$field::$re'","info");
			}
		}
		return $match;
	}
	public function processItemBeforeId(&$item,$params=null)
	{
		$crow=$this->getCurrentRow();
		$ok=(count($this->_recranges)==0);
		
		if(!$ok)
		{
			if($this->_rmax>-1 && $crow==$this->_rmax)
			{
				$this->setLastItem($item);	
			}
			foreach($this->_recranges as $rr)
			{
				$ok=($crow>=$rr[0] && ($crow<=$rr[1] || $rr[1]==-1));
				if($ok)
				{
					break;
				}
			}
		}
	
		
		if($ok)
		{
			foreach($this->_filters as $fltdef)
			{
				//negative filters
				$ok=$ok && (!$this->filtermatch($item,$fltdef));
				if(!$ok)
				{
					break;
				}
			}
		}
		else
		{
			$this->log("Filtered row $crow not in range ".$this->getParam("LIMITER:ranges",""));
		}
		return $ok;
	}
	
	public function parseFilters($fltstr)
	{
		$this->_filters=array();
		if($fltstr=="")
		{	
			return;
		}
		$fltlist=explode(";;",$fltstr);
		foreach($fltlist as $fltdef)
		{
			$fltinf=explode("::",$fltdef);
			$this->_filters[]=$fltinf;			
		}
		
	}
	
	public function parseRanges($rangestr)
	{
		$this->_recranges=array();
		if($rangestr=="")
		{
		  return;
		}
		$rangelist=explode(",",$rangestr);
		foreach($rangelist as $rdef)
		{
			$rlist=explode("-",$rdef);
			if($rlist[0]=="")
			{
				$rlist[0]=-1;
			}
			else
			{
				$rmin=$rlist[0];
			}
			if(count($rlist)>1)
			{
				if($rlist[1]=="")
				{
					$rlist[1]=-1;
				}
				else
				{
					$rmax=$rlist[1];
					if($rmax>$this->_rmax && $this->_rmax!=-1)
					{
						$this->_rmax=$rmax;
					}
				}
			}
			else
			{
				$rmax=$rmin;
			}
			$this->_recranges[]=array($rmin,$rmax);
		}
	}
	
	public function initialize($params)
	{
		$this->parseRanges($this->getParam("LIMITER:ranges",""));
		$this->parseFilters($this->getParam("LIMITER:filters",""));
		return true;
		
	}
	
	public function getPluginParamNames()
	{
		return array('LIMITER:ranges','LIMITER:filters');
	}
	
	static public function getCategory()
	{
		return "Input Data Preprocessing";
	}
}